Guidance needed: I have made an interactive map of 20+ years of UFO sightings in Denmark. How can I make a “dropbox” or secure system that will let people share sightings going foreward?

Seeking expertise: I’ve created an interactive map showcasing over 20 years of UFO sightings across Denmark. I’m now looking to expand this project by incorporating ongoing contributions. What’s the best way to set up a secure ‘dropbox’ or a reliable system that allows people to continuously share their UFO sighting experiences? I’m aiming for a user-friendly and safe platform where individuals can upload their sightings, including details and possible evidence, without compromising privacy or data integrity. Any suggestions on tools or methods to achieve this would be greatly appreciated. link: https://www.jgbh.dk/ufo-dk